Examine source code of Cashrewards

{
  "name": "Cashrewards",
  "version": "3.4.23",
  "description": "The Cashrewards Notifier is the ultimate shopping companion to access cashback deals when you shop at over 2000 stores online.",
  "homepage_url": "https://www.cashrewards.com.au/",
  "manifest_version": 3,
  "permissions": [
    "tabs",
    "alarms",
    "webNavigation",
    "storage",
    "cookies"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "all_frames": false,
      "js": [
        "js/contentBundle.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/bgBundle.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cashrewards@Cashrewards"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Cashrewards",
    "default_icon": "img/icon.png"
  },
  "options_page": "options.html",
  "icons": {
    "48": "img/48x48.png",
    "128": "img/128x128.png"
  }
}